At the point where the flight log ends, it would have taken the Mavic about 20 seconds to land if it has decided to land instead of fly back to the home point. That's most likely what it did since it was high enough to make it back to the home point and it never returned. That would also explain why you did not hear/see it when you drove to that location. Look around this area
(up in the trees too):
View attachment 12715
It's not clear as to what the OP was doing with the remote controller during those 2.5 minutes while waiting. If the remote controller was still powered on and connected to the Mavic, the Mavic would have still been obeying the remote controller sticks. So, it could have been flown further away from the last known location if that's the case.